Skip Links
Sector Participants > Calendars > Planned IT Outages

Planned IT Outages

All planned IT system outages are posted as soon as they are scheduled. Participants can view outage notification details for the same day, as well as outages planned in the future.


Participants can also view information about outages that occurred in the past 60 days by selecting Archive in the table below.

Planned Outages for 03 Aug 2021

Outage Times Systems Description
08:00 - 10:00 EST Online IESO

Due to planned outages the following actions will not be available in Online IESO:

  • create a Notice of Disagreement (NOD)

Due to planned outages the following actions will not be available in Online IESO:

  • Collect market participant data required to settle the market

Future Outages

Outage Times Systems Description
August 4, 2021
10:15 - 10:20 EST EMI EMI application used to submit bids, offers, schedules and forecast will be unavailable.EMI API application used to submit bids, offers, schedules and forecast will be unavailable.
August 5, 2021
08:00 - 15:00 EST Sandbox System and Applications Sandbox systems used for participant testing of IESO applications, including the IESO Sandbox Portal, Sandbox Reports Site, Sandbox EMI, and Sandbox Online IESO, will be unavailable.
August 7, 2021
08:00 - 13:00 EST Online IESO

Due to planned outages the following actions will not be available in Online IESO:

  • Manage meter data report profiles and to submit ad-hoc meter data requests
August 11, 2021
13:00 - 14:00 EST IESO Reports Site The Adequacy  report will not be published.
12:15 - 16:30 EST Day-Ahead Optimization System (DAOS) The Eligible Energy Limited Resource Optimization (EELR) run of the Day-Ahead Commitment Process (DACP) DAOS will not occur:
  • EELRs will be unable to resubmit their offers for consideration in the DACP after the initial DAOS run
  • If the initial DAOS run is successful, it will be considered the Schedule of Record
13:00 - 13:10 EST IESO Reports Site The Predispatch report will not be published.
12:15 - 12:45 EST IESO Reports Site Confidential Report publication will be delayed.

Public Report publication will be delayed.
12:15 - 12:45 EST Dispatch Service Automated dispatch instructions sent via Dispatch Service will be unavailable. The IESO will manually dispatch by phone as necessary. The Dispatch Service Web UI users may get disconnected and will need to login and verify connected after the outage.